EP3146189B1 - Piston for internal combustion engine - Google Patents
Piston for internal combustion engine Download PDFInfo
- Publication number
- EP3146189B1 EP3146189B1 EP15723772.8A EP15723772A EP3146189B1 EP 3146189 B1 EP3146189 B1 EP 3146189B1 EP 15723772 A EP15723772 A EP 15723772A EP 3146189 B1 EP3146189 B1 EP 3146189B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- edge portion
- piston
- top surface
- cavity
- heat insulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002485 combustion reaction Methods 0.000 title claims description 41
- 238000009413 insulation Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 17
- 238000000576 coating method Methods 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 12
- 238000007743 anodising Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229920001709 polysilazane Polymers 0.000 description 2
- -1 polysiloxane Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 241001272720 Medialuna californiensis Species 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0636—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space having a substantially flat and horizontal bottom
- F02B23/0639—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston the combustion space having a substantially flat and horizontal bottom the combustion space having substantially the shape of a cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/069—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets characterised by its eccentricity from the cylinder axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0603—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
- F02B2023/0609—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head the material being a porous medium, e.g. sintered metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Description
- The present invention relates to a piston for an internal combustion engine, and more particularly relates to a piston for an internal combustion engine in which a heat insulating film is formed on a top surface.
- Conventionally, a piston for an internal combustion engine in which a heat insulating film is formed on an entire top surface has been disclosed in
Patent Literature 1, for example. The heat insulating film is composed of a porous layer that is obtained by anodizing a surface of a piston base material of an aluminum alloy, and a coating layer that is provided on the porous layer and is obtained by plasma spraying of Y2O3 - stabilized ZrO2 powder. The coating layer is provided to close pores of the porous layer, and Y2O3-stabilized ZrO2 composing the coating layer has a lower heat conductivity than the piston base material. If the piston on which the heat insulating film like this is formed is applied to an internal combustion engine, the heat insulating property in the combustion chamber of the internal combustion engine is enhanced and cooling loss can be reduced. -
- PTL 1: Japanese Patent Laid-Open No.
2012-72745 - PTL 2: Japanese Patent Laid-Open No.
2008-111367 - PTL 3 :
JP2011 220207 A - The aforementioned porous layer is what is called anodized aluminum, and is known to have a lower thermal conductivity and a lower heat capacity than not only the piston base material but also the conventional ceramics heat insulating materials. Accordingly, the heat insulating film in
Patent Literature 1 which is composed of the combination of the porous layer and the coating layer has a low thermal conductivity and a low heat capacity as the entire film, and if the piston on which the heat insulating film like this is formed on the whole of the piston top surface is applied to an internal combustion engine, followability of a piston top surface temperature to the gas temperature in the combustion chamber can be improved. However, according to the knowledge of the present inventor, it has become clear that when the heat insulating film like this is formed on the entire piston top surface, there arises a new problem that knocking easily occurs. - The invention is made to solve the problem as described above. That is to say, an object of the invention is to provide a piston capable of favorably restraining occurrence of knocking while ensuring followability of a piston top surface temperature to a gas temperature in a combustion chamber when applied to an internal combustion engine.
- To achieve the above-described object, a first invention is a piston for an internal combustion engine comprising a piston main body, a cavity formed on a top surface of the piston main body, and a heat insulating film that is formed on the top surface, and has a lower thermal conductivity and a lower heat capacity per unit volume than an aluminum alloy that is used as a base material of the piston main body,
wherein the heat insulating film comprises a low heat insulation film that is formed on a cavity edge portion forming a boundary between the cavity and the top surface and is composed of alumina having a number of pores that are opened to the top surface, and a high heat insulation film that is formed on a surface inward from the cavity edge portion and a surface surrounding the cavity edge portion, and is composed of alumina having a number of pores that are opened to the top surface and a sealer that is provided to cover the openings of the number of pores. - A second invention is the piston for the internal combustion engine according to the first invention,
wherein the low heat insulation film is formed on the piston edge portion forming an edge of the top surface, and
between the piston edge portion and the cavity edge portion, a surface surrounding the cavity edge portion is formed - A third invention is the piston for the internal combustion engine according to the first or second invention, wherein an edge angle θ of the cavity edge portion satisfies 0°<θ≦90°.
- A fourth invention is the piston for the internal combustion engine according to any one of the first to the third inventions, further comprising:
- a valve recess that is formed in the surface surrounding the cavity edge portion,
- wherein the low heat insulation film is formed on a valve recess edge portion corresponding to a circular arc portion in a boundary between the surface surrounding the cavity edge portion and the valve recess, and
- the high heat insulation film is formed on a surface inward from the valve recess edge portion.
- A fifth invention is the piston for the internal combustion engine according to the fourth invention, wherein an edge angle θ of the valve recess edge portion satisfies 0°<θ≦90°.
- According to the knowledge of the present inventor, it has become clear that if the heat insulating film which has a lower thermal conductivity and a lower heat capacity per unit volume than the aluminum alloy which is the piston base material is provided on the entire piston top surface on which a cavity is formed, a heat spot is generated in the cavity edge portion which forms the boundary between the cavity and the piston top surface, and knocking easily occurs. The first invention is made based on the knowledge. That is to say, according to the first invention, the heat generated in the combustion chamber is enable to escape easily to the piston base material side by the structure of the low heat insulation film while followability of the piston top surface temperature to the gas temperature in the combustion chamber is ensured by the low heat insulation film and the high heat insulation film, and therefore, generation of a heat spot in the cavity edge portion can be restrained.
- A problem of generation of a heat spot can also arise in the piston edge portion which forms the edge of the piston top surface. In this regard, according to the second invention, the heat generated in the combustion chamber is enabled to escape easily to the piston base material side by the structure of the low heat insulation film formed on the piston edge portion, and therefore, generation of a heat spot in the piston edge portion can be restrained.
- When the edge angle θ of the cavity edge portion satisfies 0°<θ≦90°, the problem of generation of a heat spot tends to arise easily in the cavity edge portion. In this regard, according to the third invention, generation a heat spot in the cavity edge portion can be favorably restrained.
- When the valve recess is formed in the surface surrounding the cavity edge portion, the problem of generation of a heat spot can arise in the valve recess edge portion corresponding to the circular arc portion in the boundary between the surface surrounding the cavity edge portion and the valve recess. In this regard, according to the fourth invention, the heat generated in the combustion chamber is enabled to escape easily to the piston base material side by the structure of the low heat insulation film formed on the valve recess edge portion, and therefore, even when the valve recess is formed, an effect similar to the effect of the first invention also can be obtained.
- When the edge angle θ of the valve recess edge portion satisfies 0°<θ≦90°, the problem of generation of a heat spot tends to arise easily in the cavity edge portion. In this regard, according to the fifth invention, generation of a heat spot in the cavity edge portion can be favorably restrained.
-
- [
fig.1]Fig. 1 is a schematic view of a top surface of a piston for an internal combustion engine of the present embodiment. - [
fig.2]Fig. 2 is a sectional view taken along line A-A inFig. 1 . - [
fig.3]Fig. 3 is a sectional view taken along line B-B inFig. 1 . - [
fig.4]Fig. 4 is an enlarged schematic view of theedge portion 12a inFig. 2 . - [
fig.5]Fig. 5 is an enlarged schematic view of theedge portion 14a inFig. 2 . - [
fig.6]Fig. 6 is an enlarged schematic view of theedge portion 10a inFig. 2 . - [
fig.7]Fig. 7 is a view for explaining a difference in a coating film structure depending on presence or absence of the sealer. - [
fig.8]Fig. 8 is a diagram showing transitions of a surface temperature of the edge portion and a gas temperature in the combustion chamber in a combustion cycle. - [
fig.9]Fig. 9 is a view for explaining a manufacturing method of a piston for an internal combustion engine of the present embodiment. - [
fig.10]Fig. 10 is a view for explaining other examples of formation of the second heat insulating film. - [
fig.11]Fig. 11 is a view for explaining other manufacturing method of a piston for an internal combustion engine of the present embodiment. - [
fig.12]Fig. 12 is a schematic view of a top surface of a piston of a compression ignition type internal combustion engine. - Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that common elements in the respective drawings are assigned with the same reference signs and redundant explanation will be omitted. Further, the present invention is not limited by the following embodiment.
- [Configuration of piston]
Fig. 1 is a schematic view of a top surface of a piston for an internal combustion engine of the present embodiment. As shown inFig. 1 , acavity 12 and twovalve recesses 14 are formed on a pistontop surface 10. Thecavity 12 is provided to be recessed in the pistontop surface 10 with an objective of guiding fuel that is injected toward the pistontop surface 10 to an ignition plug (not illustrated) side. Thevalve recess 14 is provided to be recessed in the pistontop surface 10 with an objective of avoiding interference with an exhaust valve (not illustrated). Adashed line 16 shown in the drawing shows a projection line of an intake valve, and adashed line 18 shows a projection line of an exhaust valve. In a boundary between the pistontop surface 10 and thecavity 12, a ring-shaped edge portion 12a is formed. A boundary between thepiston top surface 10 and thevalve recess 14 is formed into a half-moon shape, and anedge portion 14a is formed on a circular arc portion along thedashed line 18. A part of theedge portion 14a connects to anedge portion 10a that forms an edge of the pistontop surface 10. - A first heat insulating film is formed on the piston
top surface 10. However, on theedge portions edge portions edge portions edge portions - A positional relation of the first heat insulating film and the second heat insulating film will be described with reference to
Fig. 2 to Fig. 6 .Fig. 2 is a sectional view taken along line A-A inFig. 1 . The first heat insulating film is formed on an interior constituting surface (more specifically, acavity side surface 12b and acavity bottom surface 12c) of thecavity 12 except for theedge portion 12a shown inFig. 2 . The first heat insulating film is also formed on an interior constituting surface (more specifically, a valverecess side surface 14b and a valverecess bottom surface 14c) of thevalve recess 14 except for theedge portion 14a. The first heat insulating film is also formed on a pistontop surface 10b between theedge portion 10a and theedge portion 12a, a pistontop surface 10c between theedge portion 10a and theedge portion 14a, and a pistontop surface 10d between theedge portion 12a and the valverecess bottom surface 14c. -
Fig. 3 is a sectional view taken along line B-B inFig. 1 . The first heat insulating film is formed on an interior constituting surface of thevalve recess 14 between theedge portion 10a and theedge portion 14a shown inFig. 3 , that is, on the valverecess side surface 14b and the valverecess bottom surface 14c. The first heat insulating film is also formed on a pistontop surface 10e between the twoedge portions 14a. -
Fig. 4 is an enlarged schematic view of theedge portion 12a inFig. 2 . The second heat insulating film is formed on theedge portion 12a shown inFig. 4 . A film width in a piston top surface direction of the second heat insulating film which is formed on theedge portion 12a is 2 mm at the maximum from an end point P12. A film width in a cavity direction of the second heat insulating film is similar and is 2 mm at the maximum from the end point P12. Further, an angle (an edge angle) θ12 formed by a dashed line S1 and a dashed line S2 satisfies 0°<θ12≦90°. Here, the dashed line S1 is a section line of a virtual surface formed by extension of a surface (that is, the pistontop surface 10b or the pistontop surface 10d) at a pistontop surface 10 side adjacent to theedge portion 12a. The dashed line S2 is a section line of a virtual surface formed by extension of a surface (that is, thecavity side surface 12b) at acavity 12 side adjacent to theedge portion 12a. -
Fig. 5 is an enlarged schematic view of theedge portion 14a inFig. 2 . The second heat insulating film is formed on theedge portion 14a shown inFig. 5 . A film width in a piston top surface direction of the second heat insulating film which is formed on theedge portion 14a is 2 mm at the maximum from an end point P14 of theedge portion 14a. A film width in a valve recess direction of the second heat insulating film is similar, and is 2 mm at the maximum from the end point P14. Further, an angle (an edge angle) θ34 formed by a dashed line S3 and a dashed line S4 satisfied 0°<θ≦90°. Here, the dashed line S3 is a section line of a virtual surface formed by extension of a surface (that is, the pistontop surface 10c) at a pistontop surface 10 side adjacent to theedge portion 14a. The dashed line S4 is a section line of a virtual surface formed by extension of a surface (that is, the valverecess side surface 14b) at avalve recess 14 side adjacent to theedge portion 14a. -
Fig. 6 is an enlarged schematic view of theedge portion 10a inFig. 2 . The second heat insulating film is formed on theedge portion 10a shown inFig. 6 . The second heat insulating film is formed in only the piston top surface direction. A film width in the piston top surface direction of the second heat insulating film is 2 mm at the maximum from an end point P10 of theedge portion 10a. Further, an angle (an edge angle) θ56 formed by a dashed line S5 and a dashed line S6 satisfied 90°≦θ56<180°. Here, the dashed line S5 is a section line of a virtual surface formed by extension of a surface (that is, the pistontop surface 10b or the pistontop surface 10d) at a pistontop surface 10 side adjacent to theedge portion 10a. The dashed line S6 is a section line of a virtual surface formed by extension of a piston side surface adjacent to theedge portion 10a. - A difference between the first heat insulating film and the second heat insulating film will be described with reference to
Fig. 7 . In the present embodiment, the second heat insulating film is composed of anodized aluminum. Meanwhile, the first heat insulating film is composed of anodized aluminum and a sealer. The anodized aluminum is a coating film (a film thickness of about 100 to 500 mm) of porous alumina formed on the pistontop surface 10 by anodizing of the pistontop surface 10. The porous alumina has a thermal conductivity lower than a thermal conductivity of an aluminum alloy that is a piston base material, and has a heat capacity lower than a heat capacity per unit volume of an aluminum alloy. The sealer is a coating film (a film thickness of about 5 to 50 mm) that has a silicon oxide (for example, polysiloxane or polysilazane) as a main component, and is formed on a surface of the porous aluminum. - The difference between the first heat insulating film and the second heat insulating film lies in presence or absence of the sealer.
Fig. 7 is a view for explaining a difference in a coating film structure depending on presence or absence of the sealer.Fig. 7 (a) shows a coating film structure without using the sealer, andFig. 7(b) shows a coating film structure using the sealer. As shown inFig. 7 , anodized aluminum has a plurality of pores opened to a surface thereof, and the sealer is provided in such a manner as to cover openings of the pores. Here, the sealer having a silicon oxide as the main component has a thermal conductivity lower than the thermal conductivity of an aluminum alloy similarly to the porous alumina. Accordingly, the coating film structures inFig. 7(a) and 7(b) both show high heat insulating properties. However, in the coating film structure inFig. 7(a) , compression gas and injection fuel can enter the pores, and therefore, the heat insulating property of the coating film structure inFig. 7(a) is lower as compared with the coating film inFig. 7(b) . That is to say, the coating film structure inFig. 7(a) is a structure in which heat generated in the combustion chamber escapes to the aluminum base material side more easily as compared with the coating film structure inFig. 7(b) . - An effect by the piston of the present embodiment will be described with reference to
Fig. 8. Fig. 8 is a diagram showing transitions of a surface temperature of the edge portion and a gas temperature in the combustion chamber in a combustion cycle. A "GAS TEMPERATURE" shown by the alternate long and short dash line inFig. 8 shows a transition of the gas temperature in the combustion chamber. A "NON-HEAT-INSULATING" shown by the solid line inFig. 8 shows a transition of the surface temperature of the edge portion of the piston of the present embodiment. A "HEAT-INSULATING" shown by the dashed line inFig. 8 shows a transition of a surface temperature of an edge portion of a comparison piston in which the first heat insulating film is formed on the entire piston top surface. - As shown in
Fig. 8 , the gas temperature abruptly rises by ignition in a vicinity of TDC to reach a peak. Following the rise in the gas temperature, the surface temperature of the edge portion also rises. However, in the heat insulating case, the surface temperature of the edge portion is already increased before the ignition timing. The reason thereof is that a heat spot is generated in the edge portion. Generation of a heat spot in the edge portion is caused by the structure of the edge portion, and the high heat insulating property of the first heat insulating film described withFig. 7 . If a heat spot is generated in the edge portion, knocking with the vicinity of the edge portion as an ignition point easily occurs. In this regard, the surface temperature of the edge portion before the ignition timing can be decreased in the non-insulating case of heat. The reason thereof is due to the coating film structure of the second heat insulating film described withFig. 7 . - As above, according to the piston of the present embodiment, the heat insulating property in the combustion chamber can be enhanced by the first heat insulating film formed on the piston
top surface 10. Further, by the second heat insulating film formed on the edge portion, the surface temperature of the edge portion in which a heat spot is easily generated can be restrained from excessively rising before the ignition timing. - [Manufacturing method of piston] A manufacturing method of the piston of the present embodiment will be described with reference to
Fig. 9 . The manufacturing method of the piston of the present embodiment includes a step of forming anodized aluminum by anodizing the top surface of the piston of an aluminum alloy (an anodizing step) and a step of forming the sealer by sealing the surface of anodized aluminum (a sealing step). -
Fig. 9(a) shows an anodizing step. In the anodizing step, a processing apparatus including a channel in which an electrolytic solution is caused to flow, and a pair of electrodes is used. The piston is placed in the processing apparatus, and electrolysis is performed by applying a voltage across the pair of electrodes while the electrolytic solution is caused to flow in the channel, whereby anodized aluminum is formed on the piston top surface. A porosity of the anodized aluminum is regulated to a desired value by an application voltage, and a film thickness of the anodized aluminum is regulated to a desired value by an application time period. Note that an anodizing method like this is already known, and therefore, more detailed explanation than the above will be omitted. -
Fig. 9(b) and (c) show the sealing step. In the sealing step, the edge portion is sealed first, and thereafter, a surface of the anodized aluminum is impregnated with a silicon polymer solution (polysiloxane, polysilazane or the like) to be a raw material of a silicon oxide. An impregnation method is not specially limited, and a method of spraying a solution to the surface of anodized aluminum, a blade coat method, a spin coat method, a brush coating method or the like can be applied. Subsequently, the surface of anodized aluminum is heated to a high temperature to dry/bake the silicon polymer solution. Conditions during high temperature heating (a temperature, a time period and the like) are properly regulated in accordance with an impregnation thickness of the silicon polymer solution. Finally, the seal at the edge portion is removed. By going through the above steps, the piston of the present embodiment can be produced. - Note that in the above described embodiment, the first heat insulating film corresponds to "a high heat insulation film" of the above described first invention. The second heat insulating film corresponds to "a low heat insulation film" of the above described first invention. The
edge portion 12a corresponds to "a cavity edge portion" of the same invention. Thecavity side surface 12b and thecavity bottom surface 12c correspond to "a surface inward from the cavity edge portion" of the same invention. The piston top surfaces 10b and 10b correspond to "a surface surround the cavity edge portion" of the same invention. - Further, the
edge portion 10a corresponds to "a piston edge portion" of the above described second invention. - Further, the
edge portion 14a corresponds to "a valve recess edge portion" of the above described fourth invention, and the valverecess side surface 14b and the valverecess bottom surface 14c correspond to "a surface inward from the valve recess edge portion" of the same invention, respectively. - [Other piston structures] Incidentally, in the above described embodiment, the second heat insulating film is formed in both of the piston top surface direction and the cavity direction of the
edge portion 12a as described withFig. 4 . However, the second heat insulating film may be formed in either one of the piston top surface direction and the cavity direction.Fig. 10 is a view for explaining other examples of formation of the second heat insulating film. As shown inFig. 10(a) , the second heat insulating film may be formed only in the piston top surface direction of theedge portion 12a, and the first heat insulating film may be formed in the cavity direction of theedge portion 12a. As shown inFig. 10(b) , the second heat insulating film may be formed only in the cavity direction of theedge portion 12a, and the first heat insulating film may be formed in the piston top surface direction of theedge portion 12a. - Further, in the above described embodiment, the second heat insulating film is formed in both the piston top surface direction and the valve recess direction of the
edge portion 14a, as described in explanation ofFig. 5 . However, the second heat insulating film may be formed in only the piston top surface direction of theedge portion 14a, and the first heat insulating film may be formed in the valve recess direction of theedge portion 14a. Further, the second heat insulating film may be formed in only the valve recess direction of theedge portion 14a, and the first heat insulating film may be formed in the piston top surface direction of theedge portion 14a. - Further, in the above described embodiment, the second heat insulating film is formed on the edge portions. However, the second heat insulating film may be formed on the
edge portions edge portion 10a. As described on the occasion of explanation ofFig 4 to Fig. 6 , the edge angle θ56 (90°≦θ56<180°) is equal to or larger than the edge angles θ12 and θ34 (0°<θ12, θ34≦90°). That is to say, theedge portion 10a has a gentler slope as compared with theedge portions edge portions edge portion 10a, if the second heat insulating film is formed on theedge portions - Further, in the above described embodiment, the valve recesses 14 are provided to be recessed in the piston
top surface 10, but the valve recesses 14 do not have to be provided to be recessed. In this case, if the second heat insulating film is formed on theedge portions top surface 10 except for theedge portions - Further, in the above described embodiment, the valve recesses 14 are provided to be recessed on the piston
top surface 10, and a valve recess that avoids interference with the intake valve (not illustrated) may be further provided to be recessed, in addition to the valve recesses 14. In this case, if the second heat insulating film is formed on the edge portion of the valve recess, an effect similar to the effect of the above described embodiment can be obtained. - Further, in the above described embodiment, the piston is produced according to the method described with
Fig. 9 . However, the piston can be also produced according to a method shown inFig. 11 . The production method shown inFig. 11 includes a grinding step of grinding the sealer, in addition to the anodizing step and the sealing step which are described above.Fig. 11(a) shows the anodizing step. The anodizing step is similar to the step inFig. 9(a) .Fig. 11(b) shows the sealing step. In the sealing step, sealing for the edge portion is not performed, but a sealer is provided on the surface of the anodized aluminum, unlike the sealing step inFig. 9(b) .Fig. 11(c) shows the grinding step. In the grinding step, anodized aluminum is exposed by grinding a periphery of a spot provided with the sealer. By going through the above steps, a piston similar to the piston of the present embodiment can be produced. - Further, the above described embodiment is predicated on the spark ignition type internal combustion engine including an ignition plug, but the piston of the present invention can be also applied to a compression ignition type internal combustion engine.
Fig. 12 is a schematic view of a top surface of a piston of a compression ignition type internal combustion engine. As shown inFig. 12 , a cavity 22 is formed in a center portion of a pistontop surface 20. The first heat insulating film is formed on the pistontop surface 20. However, the second heat insulating film is formed on anedge portion 20a of the pistontop surface 20 and anedge portion 22a of the cavity 22. According to the second heat insulating film formed on theedge portions edge portions -
- 10, 20 piston top surface
- 12, 22 cavity
- 14 valve recess
- 10a, 12a, 14a, 20a, 22a edge portion
Claims (5)
- A piston for an internal combustion engine comprising a piston main body, a cavity (12, 22) formed on a top surface (10, 20) of the piston main body, and a heat insulating film that is formed on the top surface (10, 20), and has a lower thermal conductivity and a lower heat capacity per unit volume than an aluminum alloy that is used as a base material of the piston main body,
wherein the heat insulating film comprises a low heat insulation film that is formed on a cavity edge portion (12a, 22a) forming a boundary between the cavity (12, 22) and the top surface (10, 20) and is composed of alumina having a number of pores that are opened to the top surface (10, 20), and a high heat insulation film that is formed on a surface (12b, 12c) inward from the cavity edge portion (12a, 22a) and a surface (10b, 10d) surrounding the cavity edge portion (12a, 22a), and is composed of alumina having a number of pores that are opened to the top surface (10, 20) and a sealer that is provided to cover the openings of the number of pores. - The piston for an internal combustion engine according to claim 1,
wherein the low heat insulation film is formed on a piston edge portion (10a, 20a) forming an edge of the top surface (10, 20), and
between the piston edge portion (10a, 20a) and the cavity edge portion (12a, 22a), a surface (10b, 10d) surrounding the cavity edge portion (12a, 22a) is formed. - The piston for an internal combustion engine according to claim 1 or 2, wherein an edge angle θ of the cavity edge portion (12a, 22a) satisfies 0°< θ ≦90°.
- The piston for an internal combustion engine according to any one of claims 1 to 3, further comprising:a valve recess (14) that is formed in the surface surrounding the cavity edge portion (12a, 22a),wherein the low heat insulation film is formed on a valve recess edge portion (14a) corresponding to a circular arc portion in a boundary between the surface surrounding the cavity edge portion (12a, 22a) and the valve recess (14), andthe high heat insulation film is formed on a surface (14b, 14c) inward from the valve recess edge portion (14a).
- The piston for an internal combustion engine according to claim 4, wherein an edge angle θ of the valve recess edge portion (14a) satisfies 0°< θ ≦90°.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014107380A JP6070631B2 (en) | 2014-05-23 | 2014-05-23 | Piston of internal combustion engine |
PCT/JP2015/002355 WO2015177980A1 (en) | 2014-05-23 | 2015-05-08 | Piston for internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3146189A1 EP3146189A1 (en) | 2017-03-29 |
EP3146189B1 true EP3146189B1 (en) | 2018-04-18 |
Family
ID=53191805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15723772.8A Active EP3146189B1 (en) | 2014-05-23 | 2015-05-08 | Piston for internal combustion engine |
Country Status (5)
Country | Link |
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US (1) | US9932928B2 (en) |
EP (1) | EP3146189B1 (en) |
JP (1) | JP6070631B2 (en) |
CN (1) | CN106164454B (en) |
WO (1) | WO2015177980A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106435506B (en) * | 2015-12-24 | 2019-03-29 | 北京师范大学 | A method of solving engine piston scuffing of cylinder bore |
JP6424851B2 (en) | 2016-03-01 | 2018-11-21 | トヨタ自動車株式会社 | Combustion chamber structure of internal combustion engine |
JP2018127972A (en) * | 2017-02-09 | 2018-08-16 | 日立オートモティブシステムズ株式会社 | Piston for internal combustion engine and method of manufacturing the same |
JP6927057B2 (en) * | 2018-01-18 | 2021-08-25 | トヨタ自動車株式会社 | Compression self-ignition internal combustion engine |
JP2021113505A (en) * | 2020-01-16 | 2021-08-05 | トヨタ自動車株式会社 | Piston of internal combustion engine and method for manufacturing the same |
CN111677598A (en) * | 2020-05-09 | 2020-09-18 | 天津大学 | Method for controlling spray of internal combustion engine to impact wall and improving combustion in near-wall area |
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- 2015-05-08 CN CN201580017375.1A patent/CN106164454B/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
JP2015222060A (en) | 2015-12-10 |
WO2015177980A1 (en) | 2015-11-26 |
US9932928B2 (en) | 2018-04-03 |
JP6070631B2 (en) | 2017-02-01 |
CN106164454A (en) | 2016-11-23 |
EP3146189A1 (en) | 2017-03-29 |
CN106164454B (en) | 2018-07-20 |
US20170122250A1 (en) | 2017-05-04 |
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